The utility model discloses an electrolytic tank for producing
hydrogen by electrolyzing water. The electrolytic tank comprises an
anode end electrolytic unit tank, a
cathode end electrolytic unit tank and a plurality of intermediate electrolytic unit tanks positioned between the
anode end electrolytic unit tank and the
cathode end electrolytic unit tank, each
electrolysis unit tank is formed by folding an
anode chamber and a
cathode chamber, and an anode side sealing
gasket, a diaphragm and a cathode side sealing
gasket are sequentially arranged between the folding surfaces of the anode chamber and the cathode chamber; an independent anode chamber liquid inlet and an independent anode chamber liquid outlet are respectively formed in the anode chamber of the
electrolysis unit tank, and an independent cathode chamber liquid inlet and an independent cathode chamber liquid outlet are respectively formed in the cathode chamber of the
electrolysis unit tank; an anode
binding post is arranged on the anode chamber, and a cathode
binding post is arranged on the cathode chamber. The device can be installed, disassembled and maintained on site at a use end, and the
transportation cost, the maintenance cost and the like caused by installation and maintenance at a production end are reduced; the electrolytic
hydrogen production mode can be flexibly switched according to different conditions, so that the advantages of electrolytic
alkaline water hydrogen production and PEM
hydrogen production are complementary.